Looking at the specs, you seem to get about 140 to 200 ish lumens out of them. A cheapo CREE LED off eBay claims 2000 lumens, and there are some 9600 lumen ones on there too. I'm guessing that's all lies tho and based on sums of the number of LED units they staple together and not actual tests....

Anyone know of an actual shop that stocks LED Lenser so I can suss out all the different sizes?

I've got any number of flashlights from dx.com, and apart from the occasional issue involving switches not being tightened up enough in the tailcap, all of the work fine, are all very bright, and are all pretty cheap. My favourite little light can be had from Amazon as well.http://dx.com/p/trustfire-r5-a3-cree-xp-e-r5-3-mode-230-lumen-memory-led-flashlight-1-aa-1-14500-39062?utm_source=dx&utm_medium=edm&utm_campaign=20120912
Amazingly bright little light, can use AA batteries, but I use 14500 Li-ion rechargables, because they're 3.7v, rather than 1.5v, so use the same charger as my bigger torches that take 18650 Li-ion batteries.
I've got a couple of Fenix torches, including one about the same size as the TrustFire above, but they're three times the price, and the TrustFire is just as bright, and very well made, I've had mine for around three years now, and they get used regularly, at work, at home, on the bikes, using Twofish lockblocks.

Myself, I'm not keen on zoomable LED lights, at the extreme end you get an image of the emitter rather than a nice smooth spot of light, which is why I like the little TrustFire, which has just about a perfect beam, with lots of throw.
230 lumens, it's quite good enough for riding dark country lanes at night. Fits neatly into a Fenix belt holster, too.

UPDATE: Got the lil fekker out. Twas a Belgian made one. Mostly pressed out in the vice with a helpfully sized bolt. The screw in the end was just the last bit of extraction (and the failed first attempt yesterday).

I then proceeded to drop the plastic contact holder doofy on the floor and lost one of the contacts, so had to get inventive with a few scrap bits of wire.

End result is, maglite is 100% operational again - old faithful lives on (with energiser batteries this time). Still quite fancy a nice LED Lenser jobbie tho...